Snatch-block



No. 770,514. PATENTED SEPT. 20, 1904. D. T. WALTERSL H.- G. PRICHARD.

SNATGH BLOCK.

APPLIUATION FILED JAN. 7, 1904.

N0 MODEL.

w/r/VESSES: Y

MMA( A Tron/vg y UNITED STATES Patented September 20, 1904.

PATENT OFFICE.

DAVID THOMAS VVALTERS AND HERBERT GREGORY PRIOHARD, O GOLDBAR,WASHINGTON.

SNATCH-BLOCK.

SPECIFICATION forming part of Letters Patent No. 770,514, datedSeptember 20, 1904.

Application filed January 7, 1904:. Serial No. 188,117. (No model.)

To all whom t may concern:

Be it known that we, DAVID THOMAS WAL- TERs and HERBERT GREGORYPRICHARD, citizens. of the United States of Americaand residents of thetown of Goldbar, in the county of Snohomish and State of Washington,have invented certain new and useful Improvements in SnatchsBlocks, ofwhich the following is a specification.

Our invention relates to improvements in snatch-blocks which are openedautomatically by a protuberance on the rope, and has for its objects toprovide a simplified, inexpensive, and durable snatch block of thisclass embodying essential features of adaptability, utility, and generalefliciency, which render it simple to apply the blockto the rope,insures a positive opening of the block, and free clearance of the ropefrom the block when open.

The above-mentioned and other objects equally as desirable are attainedby the constructions, combinations, and arrangements of parts asdisclosed on the drawings set forth in this specification and succintlypointed out in the appended claims.

With reference to the drawings filed herewith and bearing like referencecharacters for corresponding parts throughout, Figure 1 is a sid e Viewof our improved snatch-block. Fig. 2 is a vertical transverse sectionthereof, and Fig. 3 is an edge View of the block and shows by brokenlines the position of the lockinghook and movable section of the cheekas the block is about to open and also the position of the stirrup whenabout to be engaged wit said hook in closing the block.

This invention includesa shell 4, consisting of opposite cheeks 5 and 6,fastened together by suitable transverselydisposed distancepieces, ascollar-bolts 7 secured to the lower portion of the cheeks. The cheek 5is formed of two sections 8 and 9, which are connected by suitablehinges, as 10, fastened on the outer surfaces of the sections andpermitting the upper section 9 to swing outwardly.

Seated in suitable apertures formed in the cheek 6 and lower section 8of cheek 5 is the vided in the outer surface of section 8 of cheek 5about the axle-aperture therein to secure the axle from rotation, andupon this axle is rotatably mounted the sheave 14, which may be ofanyordinary or desired construction.

At the upper end of cheek Gis au upwardlyprojecting plate 15, having alug at the lower end, which fits freely between opposite lugs arrangedon the upper end portion of said piece, and in these lugs correspondingapertures are formed to receive a suitable pintle, as a bolt 16, so asto form a hinged connection between the side piece and plate, and a lip,as 17, extends upwardly from cheek 6 to engage the inner surface of saidplate to keep it from swinging inwardly. On plate 15 is atransversely-disposed locking-pin 18, which is suitably rotatablymounted at one end on said plate and extends across the frame iand isformed with a laterally-projecting hook 19 at the opposite end. On thispin a wheel 2O is fixedly mounted directly over the sheave 14, and thiswheel is formed with two rows of teeth arranged about the periphery,with the teeth of one row set opposite to the spaces occurring betweenthe teeth of the other row, so as to insure engagement with said wheelof the enlargements provided on the rope, and in the upper edge ofsection 9 of cheek 5 a semicircular notch is formed to receive the pin18 when it is resting substantially parallel with the axle of thesheave. Upon the pin 18 is also mounted a yoke 21, the stems of whichembrace the wheel 2O and are provided with corresponding aperturesfitting said pin.

freely, and mounted on the head of this yoke is a hook 22, the stem ofwhich is swiveled in a suitable aperture provided in said head at rightangles to the pin 18, thus permitting the hook to swing about the pinand also turn on the yoke, so that theblock will be freer to conformmore directly to the line of strain on the rope.

Reference-numeral 23 indicates a substantially V-shaped stirrup which isrounded at the apex to lit Vover 'pin 18 and is connected at theopposite ends of the stems with the block by a link 24, formed withopposite lugs at one end which embrace the head of axle 11, and theselugs and the head are formed with corresponding apertures through whicha pivot-bolt 26 is passed to connect the link with the head, and theopposite end of this link is formed with opposite lugs spaced somewhatfarther apart than the lugs at the other end and provided withcorresponding apertures through which a pivot-bolt 27 is passed, andthis bolt is of suitable length to project beyond said lugs and engagein suitable corresponding apertures formed in the separated ends of thestems of the stirrup, which are suitably separated at this end toembrace said link freely, so that the link will be free to swingdownwardly and inwardly and rest against the vcheek of the block whenthe opposite end of the stirrup is engaged with the pin 18, and therebybring the pivoted connection of the link with the stirrup inwardly pastthe connection of the link with the block, and thus keep the block moresecurely closed while still permitting the stirrup to be brought wellupwardly by swinging the link outwardly when desired to engage it withthe locking-pin 18 in closing the block.

When the block is closed, the parts thereof will stand substantially asshown by bold lines in the several views of the drawings, and when theenlargement on the rope reaches wheel 2O it will carry same to rotationin passing through the block, and thus turn vthe lockingpin and bringthe point of hook 19 down-v wardly, allowing the stirrup to slip free ofthe pin, and thereby release section 9 of cheek 5, which will be free toswing outwardly, and also releasing the shell of the block, so that itis free to swing on pivot 16, thus allowing the block to open widely fora free clearance of the rope.

This block is especially useful in snaking logs, as in each turn in thelogway one of the blocks may be arranged to guide the haulingrope, andas the enlargement of the rope made by the eye-splice reaches the blockit serves to rotate the locking-pin, and thereby unlocks the block,whichwill then be caused to open by the strain on the rope.

. Having thus described our invention, what we claim, and desire tosecure by Letters Patent, is

1. In a snatch-block, the combination with ashell; ofanupwardly-projecting plate hinged to one cheek of said shell, atransversely-disposed locking-pin rotatably mounted at one end on saidplate and having a hook at the opend on said plate andhaving a hook atthe op.

posite end, a link pivotally mounted on said shell and arranged to swinginwardly at the .free end and rest against said shell, and a stirrup forsaid pin pivotally connected with said link adjacent the free end.

3. In a snatch-block, the combination with a shell having a cheek partmovable to open the block; of a transversely-disposed lockingpinrotatably mounted on said shell and having a hook, a link pivotallymounted on the shell, and a stirrup adapted to engag'e said pin andpivotally engaged with said link and arranged to normally lie opposed tosaid cheek part.

4. In a snatch-block, the combination with a shell, an axle, andasheavemounted thereon;

of an upwardlyprojecting plate hinged to on-e cheek of said shell, atransversely-disposed locking-pin rotatably mounted at one end on saidplate having a hook at the opposite end, means fixedly mounted-on saidpin over said sheave to be engaged by a part of the rope, and a stirrupfor said pin swin'gably mounted on saidy shell. y

5. In a snatch-block, the combination with Va shell, an axle, and asheave mounted thereon; of an upwardly-projecting plate hinged to oneycheek of said shell, a locking-pin rotatably mounted at one end on saidplate and having a hook at the opposite end, means fixedly mounted onsaid pin over said sheave to be engaged by a part of the rope, a linkpivotally mounted on said shell, and a stirrup for said pin pivotallyconnected with said link.

6. In a snatch-block, the combination with a shell, an axle, and asheave mounted thereon; of an upwardly-projecting plate hinged to onecheek of said shell, a transversely-disposed locking-pin rotatablymounted at one end on said plate and having a hook at the opposite end,a toothedy wheel fixedly mounted on said pin over saidsheave and havingopposite rows of teeth with the teeth of one row arranged opposite tothe spaces between the teeth of the other row, and a stirrup for saidpin swingably mounted on said shell.

7. In a snatch-block, the combination with a shell, an axle, and asheave mounted thereon; of an upwardly-projecting plate hinged to onecheek of said shell, a transversely-disposed locking-pin rotatablymounted at one end on said plate and having a hook at the opposite end,a'toothed wheel fixedly mounted on said pin over said sheave and havingopposite rows of teeth with the teeth of one row arranged opposite tothe spaces between the teeth of the IOO IlO

other row, a link pivotally mounted on said shell,.and a stirrup forsaid pin pivotally connected with said link.

8. In a snatch-block, the combination with a shell, an axle, and asheave mounted thereon; of an upwardly-projecting.plate hinged to onecheek of said shell, atransversely-disposed locking-pin rotatablymounted at one end on said plate and having a hook at the opposite end,.means ixedly mounted on said pin over said sheave to be engaged by apart of the rope, a yoke embracing said wheel and pivotally engaged withsaid pin, a hook swiveled `on said yoke, and a stirrup for said pinswingably mounted on said shell.

9. In a snatch-block, the combination with a shell having one cheekJformed with an upper and a lower section hinged together, an axle, anda sheave mounted thereon; of an upwardlyprojecting plate hinged to theundivided cheek of said shell, a transversely-disposed lockingpinrotatably mounted at one end on said plate and having' a hook at theopposite end, means ixedly mounted on said pin over said sheave to beengaged by a part of the rope, and a stirrup for said pin swingablymounted on said shell.

10. In a snatch-block, the combination with a shell having one cheekformed of an upper and a lower section hinged together, an axle, and asheave mounted thereon; of an upwardlyprojecting plate hinged to theundivided cheek of said shell, a transversely-disposed lockingpinrotatably mounted at one end on said plate and having a hook at theopposite end, a toothed wheel fixedly mounted on said pin over saidsheave, a link pivotally mounted on said shell, and a stirrup for saidpin pivotally connected with said link.

11. In a snatch-block, the combination with a shell having one cheekformed of an upper and a lower section hinged together, an axle, and asheave mounted thereon; of an upward lyprojecting plate hinged to theundivided cheek of said shell, a transversely-disposed lockingpinrotatably mounted at one end on said plate and having a hook at theopposite end, means tixedly mounted on said pin over said sheave to beengaged by a part of the rope, a link pivotally mounted on said shelland arranged to swing inwardly at the free end and rest against saidshell, and a stirrup for said pin pivotally connected with said linkadjacent its free end.

12. In a snatch-block, the combination with a shell having one cheekformed of an upper and a lower section hinged together, an axleprojecting at one end beyond said divided cheek, and a sheave mountedthereon; of an upwardly-projecting plate hinged to the undivided cheekof said shell, a transverselydisposed locking-pin rotatably mounted atone end on said plate and having a hook at the opposite end, a toothedwheel iixedly mounted on said pin over said sheave, a link pivotallyconnected with the projecting end of said axle, and a stirrup for saidpin embracing said link and pivotally connected therewith adjacent itsfree end.

13. Asnatch-block comprising a shell having one cheek formed of an upperand a lower section hinged together, an axle projecting at one endbeyond said divided cheek, and a sheave mounted thereon, anupwardly-projecting plate hinged to the undivided cheek of said shell, atransversely-disposed locking-pin rotatably mounted at one end on saidplate and having a hook at the opposite end, a toothed wheel iixedlymounted on said pin over said sheave, a yoke embracing said wheel andpivotally engaged with said pin, a hook swiveled on said yoke, a linkpivotally connected with the projecting end of said axle, and aninverted substantially V-shaped stirrup for said pin embracing said linkand pivotally connected therewith adjacent the free end.

14. In a snatch-block, the combination with a shell having a cheek partmovable to open the block, an axle, asheave mounted thereon, and lockingmeans; of a wheel arranged over said sheave and operatively connectedwith said locking means and having opposite rows of teeth adaptedy toengage with a part of the rope and arranged with the teeth of one rowopposite to the spaces between the teeth of the other row.

Signed at Goldbar, l/Vashington, this 16th Witnesses:A

O. S. LEWIS, FRANCIS FIORINI.

